Crane



(No Model.) 4 Sheets-Sheet 2 J. WALKER.

TRAVELING CRANE.

No. 250,312. P tented4 N ov. 29,1881

lun/ENTER? n E m WITNEEEEE N. Firms Pmwumogmpner. waminmm'n. c

(No Model.) 4 Sheets-Sheet 3,

J. WALKER'.

TRAVELING CRANE. l I No. 250,312. Patented Nov. 29,1881.

(No Model.)

* 4 Sheets-Sheet 4. J. WALKER. TRAVELING CRANE.

Patented Nov. 29.1881.

VVITNEE'EE'E N. PETERS. Flulo-Lihugmphur, Washington. D. C.

UNITE STATES PATENT inicie.

JOHN VALKER, OF INDIANAPOLIS, INDIANA. l

TRAVELING CRANE.

SPECIFICATION forming part of Letters Patent No. 250,312, dated November 29, 1881.

Application filed August 27, 1881.. (N o niodcl.)`

To all lwhom 45t-may concern c Be it known that I, JOHN WALKER, of 1ndianapolis, in the county of Marion and State of Indiana, have invented certain Improvements in Traveling Cranes, of which the following is a specification.

This invention relates to a traveling crane in which the hoisting apparatus, instead of be- In the further description of my inventionl which follows, reference is made to the accompanying drawings, forming a part hereof, and in whichv Figure I is a side elevation of the improved crane. Fig. II is an end elevation of the same. Fig. III is a plan of Fig. I. Figs. IV and V are views of parts of the invention on an enlarged scale. Fig. VI illustrates a modified construction of the crane.

Similar letters of reference indicate similar parts in all the views.

In the said drawings, A is an elevated rail extending longitudinally of the building and near to one wall thereof. A second rail, corresponding to the one A, is similarly placed at the opposite side of the building, or, it' the span is too great, in the center of the building, and supported by a series of columns. To avoid reducing the drawings to a too small scale, one rail only is shown.

B B are transverse girders placed parallelly side by side, and united at their ends by trucks C, having wheels D, adapted to run on the rails A.

E E are brace-rods to stiften the girders, and their lengths are adjusted by means of right 'and left hand screw threads and nuts a., after the manner of ordinary truss-rods.

F is a wheeled frame, situated between the girders B, and extending to near the floor of the building. The wheels which directly support the frame F are denoted by b, and they are of the ordinary flanged truck pattern, secured to axles c, supported in suitable boxes in the frame.

G G are sheaves, adapted to turn loosely on the axles c. The lower end of the frame F is provided with hoisting machinery of the type usually employed in cranes of this class, and which needs no detailed description herein.

H is the spirally-grooved winding-drum of the hoisting apparatus, to which one end of the hoisting-chain d is attached. The chain extends directly over the sheaves G, and at its free end is provided with a hook, e, as shown.

All the bearings for the axles and the shafts carrying the truck-wheels D are fitted with anti-friction rollers. By extending the frame to near the floor and locating the hoisting apparatus as described the crane can be easily moved longitudinally and transversely of the building by hand, thus dispensing with the chains and other mechanical devices usually employed in overhead or traveling cranes for this purpose.

The hoisting apparatus is provided with a friction-brake. (Shown on an enlarged scale in Figs. IV and V of the drawings.)

The crane illustrated in Figs. I, Il, and III, although applicable to buildings in which the longitudinally-moving girders extend entirely across the same, is especially designed for use where the girdersextend only to the center of the building, and are supported by a track elevated on columns, as before alluded to. With this arrangement two complete frames with their hoisting apparatus are used.

In cases where the girders extend entirely across the building a double frame, such as is illustrated in Fig. VI of the drawings, may be employed with advantage. In this latter design the frame would have three sheaves, with a single chain attached atits center to the winding-drum. It is estimated that three coils of chain around the drum, in view ofthe weight of the end not in use, would be sufficient to prevent slipping of the chain in hoisting.- The druin could, however, have a central notch for a link to fitinto, if desired. The principal object of this double arrangement ofthe frame is to admit of objects being lifted from and deposited at all parts of the floor with a single frame, as will be readily understood.

Either ofthe hoisting-hooks, when not in use, may be suspended as shown in dotted lines, Fig. VI.

It will be understood that when one end of IOO ing downward t0 below the said girders and near to the floor of the building, a'hoisting apparatus secured to the lower end of the said wheeled frame, and a series of sheaves for the x5 hoisting-chains attached to the said frame and in positions above the said hoisting apparatus, substantially as and for the purpose specified.

JOHN WALKER.

Witnesses:

WM. T. HOWARD, JN0. T. MADDOX. 

